* Update flatbuffers to release 1.6.0
- compile shared library also
- patch CMakeLists.txt to install .dll to bin folder
- exclude CONTRIBUTING.md from extracting
* Add patch for flatbuffers (instead of sed)
* upgrade some broken packages
* correct some broken urls/checksums
* use secure urls where possible
* update PKGBUILD templates
* remove line-ending whitespace
* minor typos/fixes
Remaining md5sums either didn't download or
didn't pass checksum tests.